"The file x.kilepr cannot be opened as it does not appear to be a project file." Which didn't stop Kile from "scanning project files", which in turn blocked the entire interface. All in vain, I might add, since the project file had moved anyway, so there was nothing to scan in a folder that didn't exist any more. An existential crisis ensued: it is almost midnight, after all, and I'm in mid deadline panic.
Ah well, let's find kilerc, which happens to be in ~/.config/ (if there is a method to KDE's config folder organisation's madness I haven't found it yet). The culprit was in the FilesOpenOnStart section:
[FilesOpenOnStart]
DocsOpenOnStart0[$e]=/path/to/file1.tex
DocsOpenOnStart1[$e]=/path/to/file2.tex
EncodingsOfDocsOpenOnStart0[$e]=UTF-8
EncodingsOfDocsOpenOnStart1[$e]=UTF-8
NoDOOS=2
NoPOOS=1
ProjectsOpenOnStart0[$e]=/this/path/is/invalid.kilepr
I just had to adapt the numbers and paths of docs and projects open on start after all.
