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Reinject BTML after every game update. Then try deleting your .modtek folder, the latest ModTek seems to need to create that folder from scratch after a game update.
 
Are you using janxious BTML too as well as his ModTek? He took over both.
 
Ok, so, I've beaten the vanilla game, trying to load a mod or two, but....BTML and Modtek do not seem to be working correctly. Clean re-install, works fine. Install BTML and Modtek, but no mods, I sit at "Prepping for Combat" screen forever. Installed a mod that bypasses the 1st post tutorial mission for the metal workers and I get to space over Ur Cruinne...but next mission I try to take, I sit at the "Prepping for Combat" screen. uninstall mod, modtek and BTML, back to vanilla, game works fine. started with BTML .6.4 and Modtek .4.2, upgraded BTML to .7.0, but still have the same issue.
 
Also, if you had been using older versions of ModTek - I often find it helpful to go into the Battletech/Mods/ and delete the .modtek folder (or at least rename it and restart).

I do this after I upgrade BTML/ModTek.