Ashley doesn't know how to fix this yet. I've been using a .bat file to close Construct 2, since it always takes forever to close. Someone suggested this ages ago somewhere, but I'll summarise/repost the advice:
- Create a text file called something like "close construct.bat"
- Put the following text in it: taskkill /im construct2.exe /f
- Save it and your done, place this file somewhere so you can easily close construct quickly (I have it on quick launch bar).