After updating PS, LR, CR and Bridge to the latest versions a few days ago, all file associations in Bridge were set to "None".
I couldn't open any JPG, TIFF, PSD, DNG etc... from bridge by simply clicking on its thumbnail and "Open with" didn't work either as it wasn't showing PS as an option.
I restored the associations for the most used file types manually but this really shouldn't happen after an update.
Anyone else having the same issue?
By the way, if you restored your file associations manually DON'T click the "Reset default" or all your associations will be reset to "None".
This usually occurs because one upgrades PS, LR, CR, first and then upgrades Bridge.
Bridge is not smart enough to know that.