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Maybe the same as
http://www.intellij.net/forums/thread.jspa?threadID=234242&tstart=0

Jordan Zimmerman schrieb:

5350 out of nowhere killed my key mappings. Anyone else?

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Jordan Zimmerman wrote:

5350 out of nowhere killed my key mappings. Anyone else?


I've lost different Project- and IDE-settings several times now due to
OutOfMemoryErrors (mostly PermGen ones). The symptom is usually that IDEA hangs
with 100% CPU and has to be killed using the Taskmanager. After that, some
(seemingly random) settings are gone.

The thing to learn from this is to make regular backups of all settings and to
increase the PermGen size - especially Demetra seems to need a higher value than
5.x.

Sascha

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