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Using the current trunk on a test user dir with no VCS filesystems mounted, I chose Mount -> VCS from the filesystems popup menu. Then I selected CVS from the list, and the following exception arose. Note this problem was produced on a dual processor machine.
Created attachment 12681 [details] stack trace
Some synchronization is necessary so that VcsFileSystem.setCommands() can not be processed in parallel.
Created attachment 12697 [details] Also another CME is sometimes thrown when Customizer is invoked.
Created attachment 12746 [details] Another exception thrown after "CVS" was selected in the mount wizard.
Created attachment 12748 [details] The previous one was thrown together with this one. (Build #200401051900)
This does not happen to me after recent changes in the Customizer. I'm closing this as fixed, plase reopen if it happens again.