Problem double-click graphs

Hi everyone,
maybe the problem have been already discussed, but I didn't find it.

I'm running Igor 6.3.2.3 under windows7 and suddenly I cannot double-click on my graphs anymore to edit them (clicking on the axis or on a curve...)

Someone could help!!!

Thanks
Does this behavior only happen in one specific experiment file or in general (new experiment with some dummy data)?
Are there any hook functions in your environment?
Is there any specific reason why you are not using the latest version of Igor?
HJ
Does this behavior only happen in one specific experiment file or in general (new experiment with some dummy data)?
-->It happens for time to time for different experiments

Are there any hook functions in your environment?
--> sorry but I don't know what are hook functions

Is there any specific reason why you are not using the latest version of Igor?
--> no reason


In this case I would suggest to update Igor and see whether the issue is resolved.
In case it stays: Does this behavior "toggle" within one experiment file (i.e. the same experiment file sometimes works, sometimes not)?
HJ
Try rebooting your machine. Users reporting this problem often tell us that a reboot makes the problem go away.
OK thanks for all the comments, unfortunately right now I cannot restart my igor because I'm running an experiment with it.