Number-less solution environment
With the current solution environment, the grey arrow seems to always have a number in it. Would any of you know how to make a substitute (\begin{solution*} presumably) that doesn't have this problem? This issue arises when I try to make questions at the subsubsection level, and have to manually number them...

As I'm already updating some of the core files to solve a few issues, I'll have a look at it.
Right now, it looks very strange to me as \theQA is defined as \thesection, but clearly it gets the wrong section number. But as it is still LaTeX, I won't be surprised it is a normal behaviour.
Alright pal, no rush on it, there's an awful lot of Algo exercises left for me to make anyway...
I'm unearthing it to mention that in the LSINF1252 exercises, a counter-measure had been implemented to have nice looking solution labels. That means that, if this is issue is ever fixed correctly, then we will have a problem with this document 😅