I put this in Logos5 only because I'd not encountered it in Logos4. And it's an oddity so I used 'bug-ish'. I wouldn't pursue unless someone else experiences it.
I keep two search panels open on my 'front' window; 1 with a 'send searches here' and another for searches against only headers/large-text.
If the targeted search panel was previously Bible and a search for greek text, and then I do a right-click on greek text (for example in NA27 interlinear) and select 'search all resources', it will lock up for sure. The CPU drops to almost zero, so it's not actually doing anything. I have to kill the process and re-load.
I had thought possibly the indexing, but I notice a straight in-panel greek search on all resources returns instantly. Similarly if the panel didn't have a previous 'Bible' search in it, and searching all resources, almost an instant return of results.
So I'd assume it's the switch inside the panel? I remember something along these lines a couple years back. It's a bit of a pain if you're wanting to see the usage in the Perseus group and have to make sure to re-set the search panel first. Luckily it's Logos5 and re-loads the software fairly quick.