- Long time Mac user but never had this problem before and it's driving me nuts.
Every time I open a file by double clicking on it, it will refuse to open if the application is already open. Weirdly it will do the quick icon expanding flash you see when you open a file, but it wont load.
I will need to quit the app, then open the file again for it to open. Then, once in the application I can select open from the pull-down menu which works.
It is happening on all types on applications not just one, Photoshop, Excel, Word, Preview, Quicktime etc
I then attempted to show this to a friend and it completely stopped happening for a few hours (sods law) at that moment! It does seem to momentarily start working again.
How might I resolve this weird behaviour?