Something's going on and every once in a while (after like 2-6 hours of work) Maya decides to disallow alt-mouseclick ways of modifying the viewpoint... instead it replaces them with what appears to be the "zoom window" command... for all three...

Is there something I did? Because resetting the program works... but its quite frustrating during for instance UVmapping a model for a competition I need to post most likely tonight/tomorrow. (its 12:30 now... its fairly easy of an unwrap and I just decided a little bit ago to do it.)