Strange problem: I keep losing the ability to add inserts on mono channels. Pro Tools didn’t offer an error. You would click on the insert selector and nothing. No list of plugins. Nothing.
The only fix was to delete user preferences. /Users/<username>/Library/Preferences/Avid/Pro Tools/<delete these files>
EDIT: The problem is gone again after re-installed Pro Tools 10.3.8. It was never a problem in PT10 but when I tried to replicate the problem, PT10 told me I needed a DSP Mixer plugin. Not finding one, I reinstalled PT10. Now I can’t seem to recreate the problem in PT11.
Solution: Originally I thought it must a permissions issue. Maybe the user didn’t have permission to the mono plugins. But, then again, Avid bundles their AAX plugs (mono, multiple mono/stereo) into one AAX file. So, after reinstalling Pro Tools. Updating Pro Tools, and Updating my plugins, the problem still came back after I began working in a session. Then I started deleting individual preferences.
After multiple attempts of deleting only selected user preferences, I started to think there might be a problem with my IO setup. Consistently, each time I deleting all the prefs and starting Pro Tools, everything would work but my IO setup was reset to the factory default. After I imported my custom IO setup, my mono insert problem would come back.
For reasons I still don’t understand, mono inserts are only available if I have ALL the default paths in the Insert tab of the IO setup. Even though I’m trying to instantiate internal plugins and the insert tab in the IO setup is to design output paths.
IO Setup (below): Still can’t instantiate plugins on mono tracks.
IO Setup (below): This works. You can instantiate plugins on mono tracks.
So far, the problem seems to be isolated to one computer. OSX 10.8.5 Pro Tools HD 11.2.1