Last night, during a base clearing mission, I got stuck at the download menu (exit wouldn't work) when trying to download some data packages. After trying multiple key combinations, I finally found that holding down the right mouse button freed me eventually from the menu (although I was unable to download the data packages successfully). Just a fix in case you run into this bug as it can be a real mission killer.
CMDR Marcus "Scav-Hunter" Bulltarsky
CMDR Marcus "Scav-Hunter" Bulltarsky
o7!