I've been out of the scene for awhile now. I ended up reading about some of the new things here and on other forums and I decided to go ahead and purchase the EP and Stuff packs that I either hadn't gotten before or were new.
All the installs went just fine but I found out the hard way that not all the custom content I had before, like Inteen, were not compatible. To be honest, they didn't even cross my mind when I started playing the game again, until I started having problems.
The first problem I found were missing item icons from the purchase menus. There's a thread on MTS2 where a user had an identical problem as me. Not sure if it's ok to link here or not, so I won't, but the thread title is "Invisible/missing items" by Maybug283. In a nutshell, the items have no icon but can be bought, when you go to place them the grid shows underneath it, but you can't see the item, and once placed it's like it was never purchased.
I currently have all the EPs and Stuff packs with the exception of Celebration stuff, which is bizarre because I could have sworn I had that installed before. I had bought a Deluxe version of the software and I could swear it was included. In any case, I haven't applied any fixes to the AL EP because I've read of a lot of people having problems afterward. I guess if this is what is causing my problems then I'll do the updates, but I'd just assume wait until things are less buggy.
The other thing I guess I should mention in all fairness to those who might try to help is that I found that I had installed a few things incorrectly. Please don't beat me too badly.

Other than that I didn't have any issues that I'm aware of. I have since removed Inteen and corrected the install of Insim with the newest version. I dumped all my downloads and have started to add them back one by one and testing the game to see if they work ok.
In regards to my missing items, is this something that I should consider a reinstall for, or is there some other way to fix these. It's not the end of the world either way.
Thanks much for the help!