most of the time a problematic plugin (most often one that tries to accesses moved/deleted files) is the reason why a project can not be opened.
now there is shift + Strg + Alt to disable all program settings and the Workaround to rename folders on the disk so plugins can not be located.
I would like to keep the settings but have something like “open project without plugins”.
First it could be as simple as pretending all plugins could not be found (as with renamed folders), but some day there should be a way to enable them one by one in the project to quickly find the one that causes trouble.
alternative: store tracks and plugins in an human editable xml-part of the project file, so one can edit by hand.