Error (ERROR_LOCK_TIMEOUT)

Hi,

I recieved a couple of times now the message:

Error (ERROR_LOCK_TIMEOUT)<b>in</b>
modules/core/classes/GalleryStorage/GalleryStorageExtras.class <b>at
line</b> 1980 (GalleryCoreApi::error)
<b>in</b>
modules/core/classes/GalleryStorage/GalleryStorageExtras.class <b>at
line</b> 683 (GalleryStorageExtras::_getLockClearance)
<b>in</b> modules/core/classes/GalleryStorage.class <b>at line</b>
396 (GalleryStorageExtras::acquireWriteLock)
<b>in</b> modules/core/classes/DatabaseLockSystem.class <b>at
line</b> 42 (GalleryStorage::acquireWriteLock)
<b>in</b> modules/core/classes/GalleryLockSystem.class <b>at line</b>
147 (DatabaseLockSystem::_acquireLock)
<b>in</b> modules/core/classes/helpers/GalleryLockHelper_simple.class
<b>at line</b> 176 (GalleryLockSystem::acquireWriteLock)
<b>in</b> modules/core/classes/GalleryCoreApi.class <b>at line</b>
2291 (GalleryLockHelper_simple::acquireWriteLock)
<b>in</b>
modules/core/classes/helpers/GalleryDerivativeHelper_advanced.class
<b>at line</b> 833 (GalleryCoreApi::acquireWriteLock)
<b>in</b> modules/core/classes/GalleryCoreApi.class <b>at line</b>
997 (GalleryDerivativeHelper_advanced::rebuildCache)
<b>in</b>
modules/core/classes/helpers/GalleryDerivativeHelper_simple.class
<b>at line</b> 50 (GalleryCoreApi::rebuildDerivativeCache)
<b>in</b> modules/core/classes/GalleryCoreApi.class <b>at line</b>
984 (GalleryDerivativeHelper_simple::rebuildCacheIfNotCurrent)
<b>in</b> modules/core/DownloadItem.inc <b>at line</b> 109
(GalleryCoreApi::rebuildDerivativeCacheIfNotCurrent)
<b>in</b> main.php <b>at line</b> 450
(DownloadItemView::renderImmediate)
<b>in</b> main.php <b>at line</b> 104
<b>in</b> main.php <b>at line</b> 88

when I edit the captures on new added items in an album.
Can someone tell me what is happening and how I can overcome this issue? Gallery 2.3 seems to work normally.

Thanks,

Rick.