Can't open upgrades menu in MvM

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I was playing on the Rottenburg map and after losing a couple waves, I tried to open the upgrade menu and couldn't. I would walk up to it and nothing appeared.
This happened to me a couple times and both times the only way to fix it was leaving the game. I've tried to join spectate and then click random but that didn't work
How can you fix this bug without having to leave the game?
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How do you play MVM with bots?
How to have RED bots in MVM! It is very simple, all you have to do is open the map, type "sv_cheats 1" in the console, go near the BLU robot area and put in the console "ent_create item_teamflag GameType 1 TeamNum 0". That will spawn a neutral flag that either team can pick up.How do you ready up in TF2 MVM?
If not, in TF2 go to options, keyboard bindings, check Toggle Player Ready (last item under Team Fortress group): should be blank by default for F4, see if it's been changed or change it to another key if F4 is broken.Can you get items in MVM TF2?
Mann Up is the official version of the Mann vs. Machine game mode that allows players to receive items upon finishing a mission. The mode is accessible only by owning a Tour of Duty Ticket, a tool that allows entry into official Mann Up servers, which is consumed upon finishing a mission.How do you upgrade weapons in TF2?
Weapon level is utterly meaningless in TF2. Every weapon has a set level that cannot be altered or changed in any way, and which ultimately means nothing. It grants no increased damage or other effects of any kind.Can - Mother Sky (1970) [HQ]
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