Can't Filter in Query Studio

[kawabunga]

Has anybody encountered instances where you can't filter a column in Query Studio? The column would turn yellow (or orange) but would not bring up the filter window. I've looked at my IE 9 settings (vers 9.0.8112.16421 64-bit ed) and they seem to be fine (pop-up blocker is turned off). I then have to delete my browsing history which sometimes works. If it doesn't work, I resort to re-booting which most times work. Has anybody encountered a similar situation?