http://bugs.winehq.org/show_bug.cgi?id=31071
--- Comment #66 from Anton Vorobyov phoenix@mail.ru 2012-07-23 10:39:10 CDT --- No proper fix available yet, only temporary workaround, which disables glow effects altogether (it involves reverting mentioned commit & recompiling wine, so i doubt you can do this easily with your custom wine on mac).
As for text - it's completely other problem, introduced recently by some dota update. Yes, i also experience it.