I am running 5622 but I am sure I noticed this issue starting in the last few EAP builds.
What happens is that I take my laptop home from work and so am disconnected from the network where the CVS server runs. Everytime I save a file (and on other occasions too), I get an error popup complaining that the CVS server cannot be found. This never happened in 5.1 and only started recently in the 6.0 builds.
It makes the IDE totally unusable "offline". Please, can it be fixed before 6.0 ships? I found a jira issue IDEADEV-6690 that talks about a similar problem but it does not mention the error popups. I think it must be related to the new way change tracking is done?