Well, I got back to the upgrade wizard today after several monthes of failure (see my previous topics) Just to see…
Suddenly, the first page of the wizard appears. Some foolish hope in the heart, I clik on “next” : next page appears !
Then, a messages tells that a package 7.2.1 is ready for installing. Holly Grail ! It was there since november 2015. This is the update that ended to a totally blank page and never wanted to get through. Backup the whole thing and attempt update. Still full of doubts about success. But it goes through the whole cycle and here is V 7.2.1 !
So I tried to update completely SuiteCRM; I downloaded the next 4 packages and got it through. Oh man ! My CRM is now V7.6.3 !
Just to see, I get back to the upgrade wizard page : that’s it, it’s now completely blank again, and out of order.
Just an hour of luck.
Seriously, this is quiet mysterious.
What the hell is going on with this upgrade wizard ?
:woohoo:
New unpredictable behaviour :
I got back to this unpredictable wizard :
1st time : blank page
2nd time : welcome page ok. Blank page after system check
3rd time : same
4th time : Wizard do work.
Someone got an idea about what’s going on ? 
Oh ! after the 7.2.1 update, I lost all my colour customization (nothing bad happened to fields and layouts)