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This happens rarely and I'm not able to reproduce it on demand. Sometimes, while working in the Explorer window the Filesystem tree is collapsed for no apparent reason. All nodes except the root disappear and need to be re-expanded one-by-one. I have been experiencing this since FFJ 1.0 and it occurs in the latest development builds too.
I've the same problem in netbeans [build 12], but after this I've second problem - expand package - display popup menu all item in popup menu is disabled, within one (Tool | Add to JAR) (in main window menu "Edit" too) I think, that have it relationship.
Petr Hrebejk, probably fixed this, sometimes at the end of year 2000. Release 3.1 should not contain that bug.
Resolved for 3.4.x or earlier, no new info since then -> verified
Resolved for 3.4.x or earlier, no new info since then -> closing.
*** Issue 109150 has been marked as a duplicate of this issue. ***