I was following the tutorial on Lingtran.net on Paratext/Flex integration.
Link to Flex project backup
I restored the Paratext project TKE_GAa, then restored the FLEx project Takwane Thematic Dictionary … in FLEx. When I tried to lookup a word from Paratext, it said access to the lexical project was denied. I puzzled over this for a while, then realized if I shut down FLEx then restarted it, I could access the project from Paratext. I have confirmed that this happens – I deleted the FLEx project, then restored it again, and again Paratext said access was denied, until I restarted FLEx.