It sound like you either have a Photoshop bug and Photoshop hangs. Or your machine is failing. Of there is a problem with you Photoshop's installation.
The first thing you should do is to reset all Photoshop Tools and your User ID Photoshop Preferences. See if that clears up you Photoshop hanging problems.
If Photoshop still hangs you need to provide more information.
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This also happens to me. It started a month or two ago. Updating and reinstalling Photoshop CC has no effect. Happens on several machines, so it's definitely a bug. The only way to get rid of the window is to restart the program, or just move it off to the side and ignore it, as it seems to have no effect on actually using the software.
What is getting stuck? the original poster stated gaussian blur as one tool that may hang but the append seemed to indicated other functions may also hang. I think you need to try to track down what triggers the bug to bite. Some document condition, a particular sequence of steps. Random Hangs are not easy to trouble shoot. Something triggers the bug to bite what bates the bug into action. Check to see if the bug has been reported to ADone one ther site Photoshop Family Customer Community . If you can not find it has please report you bur to Adobe there Photoshop Family Customer Community
It seem like your Photoshop is not actually hanging it is just that Progress bar window does not close when the process has completed. Photoshop keep on working you can use. If you click on the Progress bar window will it get focus and will Alt+F4 close it if you use Windows.
The issue is that the progress window doesn't disappear after filters are run. Only happens after running filters, but doesn't seem to be related to a particular filter or subsequent operation. As stated, operation of the software isn't effected (no hanging), and the window cannot be closed, including using Alt-F4. Probably a redraw bug--I'll make a report. Thanks!