You're using Paragon Chat from a shared volume? (Assuming D: is OneDrive) Not sure this is supported... the client isn't designed to handle file locking from multi-user environments (not talking about Paragon Chat, but the COH client itself.)
If I'm wrong, please correct me.
Oh, sorry, I don't know what the client can support. However, the whole thing is installed on D: in Users/My Documents, and I logged on and was able to fly to different zones and use the T and stuff. No one else was on so I logged off, but it seems to work fine.
My OS is on C: which is an SSD, so I install mostly everything else on D (SATA 7200 RPM) so as not to beat on the SSD overly much. What shouldn't I be able to do from D:? If you give me some ideas, I can check if those things work or not.
The whole .pigg file thing seems not to have affected anything so far. They were music files at one point it was giving me install errors on, but when I fly over Atlas, that beloved theme still plays; so far, so good.