Charly,
No, if you deactivate and reactivate there’s nothing deleted. If you delete the plug in folder (which shouldn’t have to be done, but a few said that’s what they did) it still doesn’t delete data.
At the same time, I would back up your data to be 100% positive you’re covered, just in case something goes wrong. I’ve had way too many things over the years screw up when ‘just doing a quick experiment’ or whatever…
There’s no good explanation to any of this. The class it’s calling for is where it needs to be, as is everything else, but the sport files are throwing the error. Something changed, and I think it has to do with the fixes I am working on to fix PHP Strict error warnings. Stuff that has to be done and there’s a lot of it, so it’s possible something somewhere gets broken. The thing is, I’m not seeing most of these errors on my install.