http://bugs.winehq.org/show_bug.cgi?id=31374
--- Comment #24 from Michael Abbott michael@araneidae.co.uk 2012-08-25 05:29:58 CDT --- Note that when steam restarts itself (after an update), it doesn't apply the -no-dwrite flag, so a second manual restart with this flag is required. I'm not seeing the problem reported by AG, and am also on Arch.
By the way, the severity of this problem is not "trivial", it is at best "minor":
minor For minor loss of functionality, or other problem where an easy workaround is present
trivial For a UI glitch that doesn't affect running of a program
Steam is unusable without the workaround, so "trivial" is inapplicable.