I couldn't call in my Guards Squad when I had sufficient manpower (~450) so I had to delay and get an AT gun. Everything ended up working out fine but I thought I would get easily base pinned and lose :/
After I turn the game around in the late game, I get a sync error. To me, it feels suspicious because it seemed that my opponent was pursuing a sort of cut-throat competitive mentality, utilizing a strategy that would grief a player (aka goliaths). When it became apparent that he was going to lose (lost 2x P4s, one abandoned right outside my base, lost his 3rd or 4th Luchs) the game quit. I still got the win anyway, according to my playercard, but still, it feels fishy.
Anyway, biggest issue here is the Guards squad not working. I spent mp and when I got 360 mp I was able to purchase the squad (and did so).
***Edit*** The popcap limit reached bug seems to be the result of me not reaching 3 CPs (ninja change). I haven't confirmed that by watching the replay over again, but that's most likely the culprit.
Yes 3 cp guarde bug.
Relic is working on that