Currently using 7075. But many previous versions behaved in the same way.
I tried, first, in the way I always did: just placed a comment like this:
or
.
Then I tried the "right click -> Add todo item..." thing.
Tried clicking refresh under the todo window.
Tried changing scope... nothing changes the window. It's simply empty.
One thing I noticed however is that before the last two builds, whenever I opened a project I had a very fast window appear and disappear. I suspect it was something related to the refreshing of the todo list. Not sure.
It is not happening with current build and it didn't happen with previous build (7040).
I searched everywhere to see if there was any setting related to this plugin. I found nothing but "enable/disable - install/uninstall" at the plugins manager.
Unfortunately I didn't take note of when this plugin failed here. However, for now I'm just "Ctrl-F" and manually locate the TODOs in my code.
Thanks for your attention!