Chris Muller uploaded a new version of Monticello to project The Trunk:
http://source.squeak.org/trunk/Monticello-cmm.453.mcz

==================== Summary ====================

Name: Monticello-cmm.453
Author: cmm
Time: 7 April 2011, 1:13:37.47 pm
UUID: ee1e4219-7021-4085-bc57-7f6e94ac5213
Ancestors: Monticello-bf.451

Also flush 'allFileNames' when flushing repository cache to fix the rare case where the ensure block in cacheAllFileNamesDuring: does not get executed; because that situation prevents ability to Refresh a repository.

=============== Diff against Monticello-bf.451 ===============

Item was changed:
  ----- Method: MCFileBasedRepository>>flushCache (in category 'private') -----
  flushCache
+ 	cache := allFileNames := nil!
- 	cache := nil!