don't you remember if the problems were with the default template, or not?
may be wrong but it must be about the compatibility of old default template with the new version of jquery
Yes, the problem was about compatibility of old default template (of 2.3m) with the new version of jQuery v1.12.4.
The latest tests I did the other day, were only using the default template of 2.3m. Using Iron 31 worked fine (and anything more modern than that). When I said 'you won't like to hear this' it was because the compatibility problem was with 'really' old browsers, like Firefox 3.x and IE6 (and could be more old browsers).
I could report exactly what it fails (with screenshots), since I have access to those browsers (in case you care about). But those were 'action' buttons not showing up (in Firefox 3.x), and IE6 was working better (this surprised me), only having the file 'selection panel' doesn't showing up. It could be more missing, since I can't remember exactly all now.
I reported this is issue because the default template of v2.3m was working absolutely fine BEFORE with those old browsers (and because some users could be still using and depending on those old browsers), but like I've said on previous posts,
this issue particularly doesn't affect me (one because I mostly use Iron 31 which works fine now, and second because I could patch the old template to use jQuery v1.4.2 in case I need).
But that doesn't mean this issue still exists, and that it could affect other old custom templates too.
ANOTHER THING: I also discovered that the new template of v2.4 is not 100% compatible with the old jQuery v1.4.2. If my tests are not wrong (at least when using Iron 31), when using the new template with the old jQuery, you will find all the main buttons on the header missing, and the 'more options' menu not responding when clicking on it. So, I have my doubts now if this is worth all the hassle, just to keep jQuery v1.4.2.
But if you fix the new template to be working with jQuery v1.4.2, then go ahead with jQuery v1.4.2 (this would be the best solution, if it's not too complicated for you to fix it).That's why I leave this decision up to you. In my opinion, when you release v2.4 (if you want to keep jQuery v1.12.4), you should at least warn users that old templates could be broken when using a truly old browser.
But the best solution (that's my suggestion only), would be fixing the new template of v2.4 to be working with jQuery v1.4.2 (so you could include jQuery v1.4.2 by default).I'm attaching the new template of v2.4 with old jQuery v1.4.2 embedded on the same file, to make your tests easier
(but don't rely on it, since I can't be sure if it's from Beta 4 or 5). You will find it doesn't work as expected...
I hope this helps...