You cannot assign the single keyboard shortcut to 2 functions in Indesign at same context so you can check to what function this keyborad shortcut is applied to aind to which context.
Remove if you find this keyborad shortcut applied anywhere else,
else, Replace your preferences.
Yes, I know. My posting was apparently not clear. First, I have not assigned any new keyboard shortcuts for several months, so it is not from a new assignment. Second, I cannot find this shortcut listed when I searched through all the keyboard commands that I have in my custom layout. This is why I am puzzled. I have not made any change yet this has happened and I cannot find out why.
Can you check these, under "Product area: Views, Navigation"?
Open/Close all panels in side tabs --- Default: Opt+Cmd+Tab
Open/Close panels in left side tabs --- [none defined]
Open/Close panels in right side tabs --- [none defined]
(Although I doubt it's actually one of these that suddenly gained a hotkey. I can't think of a function that moves your panels from left to right.)
Coincidentally (or not), did you know that Ctrl+I (Cmd+I in Mac parlance) historically inserted a Tab character in the absence of a real Tab key? And the Tab key is used for manipulating panels. Did you recently install some sort of keyboard helper software, or some other background software that acts on a system global hotkey? IIRC, these have been known to mess up ID's own key handling.
Than you for your guidance. I checked as you suggested and the setting is as you describe. Still a mystery. Just checked and once again Shift/Command/I moves the panels to the left side. Sigh!
Have you verified that you are using the correct shortcut set? You can set up to nine shortcuts to choose one of your user workspaces (one per workspace). Any chance you have a worksapce that's configured this way?
If not, try trashing the prefs as Manish suggested above.
If you are referring to keyboard shortcut sets, then yes, it is set to the same custom set I have had the last couple of years. Workspace also set to the same custom I have been using for that time.
Q. If I trash prefs I have to recreate my workspace and custom keyboard set?
No. You will have to reselect the shorcut set to use it, and perhaps the workspace, but those are not erased from where thay are stored. Read the link.
Thanks for the guidance. I did read about resetting prefs and did so manually. On reopening ID, the same issue existed, however I figured it out and traced it to a third party program called Moom which sets windows into a particular position. I had put in a keyboard shortcut into that program that would put the ID window where I wanted it and it was intercepting the same commands used for text italic. Strangely, it was affecting the palette and not the window that I had specified for its action. Quitting Moom solved the problem and all is again right with the world.