First, the two things that fix most of it: pull down to refresh in the apps, or reload the page on the web; and if that fails, sign out and back in.
If a screen shows an error, use the Tell GigSpace what happened button on it if there is one. That sends us which screen and what went wrong, which is far more useful than a description from memory.
Otherwise, contact us and tell us: what you were trying to do, what happened instead, roughly when, and which app or browser. A screenshot is worth a paragraph.
If it's stopping a gig going ahead today or tomorrow, mark it urgent.
We'd much rather hear about something small than have you work around it for a month.