Glad to know you managed to solve this issue.
Fixed it myself. Nobody from Pleiades Astrophoto helped....
Sorry for not being as fast as you expected (please note that your original question was posted today at 00:45 for us). For the record, here is the solution to this problem:
- From the main menu, select
Resources > Updates > Manage Repositories.
- On the Manage Update Repositories dialog, click Default, then OK.
This will reset update repositories to the default ones required by the running PixInsight application. This problem should not happen under normal working conditions.