diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8de6afe5..cddb20ca 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- **Languages**: Set as Default no longer stays disabled after open. Default-language lookups use a single `/api/` slash so Spring Security 7 accepts `findByName`.
+- **Grids**: AG Grid 32 registers `CommunityFeaturesModule` so text/select cell editors mount. Date columns use the Instant-safe `datePicker` editor with `cellDataType: false` so Positions Alta/Baja edit no longer throws in `DateStringCellEditor`.
 - **Tests**: Jest specs match Angular 22 realities (`ng-reflect-*` opt-in, HostListener rename, `@if (; as)` syntax, jsdom Location, FileReader under Node 24) and use a 30s default timeout.
 
 - **Layers**: An Image feature-information field stores max width and max height in its options. The picture address stays unchanged.
diff --git a/src/app/components/literal-translations/literal-translations/literal-translations.component.ts b/src/app/components/literal-translations/literal-translations/literal-translations.component.ts
index e0ef67fa..7ad548fa 100644
--- a/src/app/components/literal-translations/literal-translations/literal-translations.component.ts
+++ b/src/app/components/literal-translations/literal-translations/literal-translations.component.ts
@@ -6,7 +6,15 @@ import { MatDialog } from '@angular/material/dialog';
 import { MatSnackBar } from '@angular/material/snack-bar';
 
 import { AgGridModule } from '@ag-grid-community/angular';
-import { CellClickedEvent, ColDef, FilterChangedEvent, GridApi, GridReadyEvent, ModuleRegistry } from '@ag-grid-community/core';
+import {
+  CellClickedEvent,
+  ColDef,
+  CommunityFeaturesModule,
+  FilterChangedEvent,
+  GridApi,
+  GridReadyEvent,
+  ModuleRegistry,
+} from '@ag-grid-community/core';
 import { InfiniteRowModelModule } from '@ag-grid-community/infinite-row-model';
 import { TranslateModule, TranslateService } from '@ngx-translate/core';
 import { debounceTime, forkJoin, tap } from 'rxjs';
@@ -35,7 +43,7 @@ import {
 import { filterEnabledLanguages } from '@app/services/ui-language.resolver';
 import { config } from '@config';
 
-ModuleRegistry.registerModules([InfiniteRowModelModule]);
+ModuleRegistry.registerModules([CommunityFeaturesModule, InfiniteRowModelModule]);
 
 @Component({
   selector: 'app-literal-translations',
diff --git a/src/app/domain/translation/services/language.service.ts b/src/app/domain/translation/services/language.service.ts
index f94b9d6d..4cf2faca 100644
--- a/src/app/domain/translation/services/language.service.ts
+++ b/src/app/domain/translation/services/language.service.ts
@@ -89,7 +89,7 @@ export class LanguageService extends RestService<Language> {
    */
   getCurrentDefaultLanguage(): Observable<string> {
     return new Observable(observer => {
-      this.http.get<{ value: string }>(`${this.resourceService.getResourceUrl()}/configuration-parameters/search/findByName?name=language.default`)
+      this.http.get<{ value: string }>(this.apiUrl('configuration-parameters/search/findByName?name=language.default'))
         .subscribe({
           next: (config) => {
             observer.next(config.value);
@@ -105,7 +105,7 @@ export class LanguageService extends RestService<Language> {
    */
   previewDefaultLanguageChange(from: string, to: string): Observable<DefaultLanguageChangePreview> {
     return this.http.post<DefaultLanguageChangePreview>(
-      `${this.resourceService.getResourceUrl()}/language-default/change-preview`,
+      this.apiUrl('language-default/change-preview'),
       { from, to },
       {context: new HttpContext().set(SUPPRESS_HTTP_NOTIFICATION, true)}
     );
@@ -116,9 +116,14 @@ export class LanguageService extends RestService<Language> {
    */
   applyDefaultLanguageChange(request: DefaultLanguageChangeRequest): Observable<DefaultLanguageChangeResult> {
     return this.http.post<DefaultLanguageChangeResult>(
-      `${this.resourceService.getResourceUrl()}/language-default/change`,
+      this.apiUrl('language-default/change'),
       request,
       {context: new HttpContext().set(SUPPRESS_HTTP_NOTIFICATION, true)}
     );
   }
+
+  /** Avoid `…/api//path` from getResourceUrl()'s trailing slash (401 under Spring Security 7). */
+  private apiUrl(path: string): string {
+    return `${this.resourceService.getResourceUrl().replace(/\/$/, '')}/${path.replace(/^\//, '')}`;
+  }
 }
diff --git a/src/app/frontend-gui/src/lib/data-grid/data-grid.component.ts b/src/app/frontend-gui/src/lib/data-grid/data-grid.component.ts
index 02b52149..d5420298 100644
--- a/src/app/frontend-gui/src/lib/data-grid/data-grid.component.ts
+++ b/src/app/frontend-gui/src/lib/data-grid/data-grid.component.ts
@@ -27,7 +27,7 @@ import {MatTooltipModule} from '@angular/material/tooltip';
 
 import {AgGridModule} from '@ag-grid-community/angular';
 import {ClientSideRowModelModule} from '@ag-grid-community/client-side-row-model';
-import {GridOptions, ModuleRegistry} from '@ag-grid-community/core';
+import {CommunityFeaturesModule, GridOptions, ModuleRegistry} from '@ag-grid-community/core';
 import {CsvExportModule} from '@ag-grid-community/csv-export';
 import {InfiniteRowModelModule} from '@ag-grid-community/infinite-row-model';
 import {TranslateModule, TranslateService} from '@ngx-translate/core';
@@ -61,9 +61,11 @@ import {DialogMessageComponent} from '../dialog-message/dialog-message.component
 import {EditableLinkRendererComponent} from '../editable-link-renderer/editable-link-renderer.component';
 import {RouterLinkRendererComponent} from '../router-link-renderer/router-link-renderer.component';
 
-// Removed jQuery dependency
-
+// AG Grid 32 moved editors/filters into CommunityFeaturesModule; without it,
+// inline editors never mount. Date columns still use the grid's datePicker
+// component (Instant-safe); CommunityFeaturesModule covers text/select editors.
 ModuleRegistry.registerModules([
+  CommunityFeaturesModule,
   ClientSideRowModelModule,
   InfiniteRowModelModule,
   CsvExportModule
diff --git a/src/app/services/utils.service.ts b/src/app/services/utils.service.ts
index dc0a1cf9..618f283a 100644
--- a/src/app/services/utils.service.ts
+++ b/src/app/services/utils.service.ts
@@ -434,6 +434,10 @@ export class UtilsService {
       filter: 'agDateColumnFilter',
       filterParams: this.getDateFilterParams(options),
       editable: editable ?? false,
+      // HAL Instant ISO strings are not AG Grid dateString (YYYY-MM-DD). Leaving
+      // cellDataType on lets DataTypeModule infer "text", then
+      // agDateStringCellEditor crashes: getDateParserFunction is not a function.
+      cellDataType: false,
       emptyValueKey: options?.emptyValueKey,
       headerTooltip: options?.headerTooltipKey
         ? this.getTranslate(options.headerTooltipKey)
@@ -444,7 +448,8 @@ export class UtilsService {
         }
         return this.getDateFormated(data);
       },
-      cellEditor: 'agDateStringCellEditor',
+      // Native datePicker parses Instant via Date(); agDateStringCellEditor does not.
+      cellEditor: 'datePicker',
       cellClass: (editable ?? false) ? null : 'read-only-cell'
     };
   }