hi again; though I think I am just talking to myself. I deleted all the mods and tryed a Mechlab mod and the game worked first try. the other mods absolutely have issues or at least one of them does. so I was in the first mission and I couldnt understand why I was getting my bum kicked by Tanks and turrets. the mod apparently changes their HP multiplier up to 3 times what they normally can take. yes ; I bet you guys are thinking { been there done that } luckily the mod allows it to be changed on the title screen. FUN FUN

the Mod that worked was { Yet Another Mechlab} be interesting in how it affects gameplay the further I go.

I've been having issues as well. Yet another mechlab does similar things but I think I like Merctechs options better. I don't think Merctech and Yet another mech lab are compatible. That said it looks like Merctech is not updated for the latest DLC. The mod author says he is waiting to update until the DLC comes out next week since its so close.

You can revert back to a previous version of mw5 but I've had issues even reverting back. it might be best to wait a week which sucks but that's what I'm doing. You may just try and play without mods until things are updated. or use YAML I suppose.

Merctech is indeed not compatible with the new DLC and hasn't been updated for quite a while due to it undergoing a major overhaul with focus on making Co-Op functional.

I suggest to bide your time with YAML and wait for Merctech V3 to come out.
It shouldn't be that far away anymore but that's just an educated guess of mine.

to use the Version of Merctech on Steam you have to go back to the 315 version of the Game. They Are Working on Merctech V3 but it is not ready yet