Hi, I'm checking in again to see if anybody had taken a look at my bug report, http://www.twistedmatrix.com/users/roundup.twistd/twisted/issue552 I discussed it a little bit on a slow day on IRC, but nobody had any solutions. However, it was reproduced on NetBSD-current w/ pygtk-2 and gtk-2.4, so I'm pretty sure it's not specific to my location. In summary: I'm using the gtk2reactor, and periodically scheduled events (invoked via reactor.callLater->reactor.callInThread) are not being fired in a timely fashion. When I originally mentioned the bug on the mailing list, people thought I was calling 'sleep' in the main (reactor) thread, but actually, sleep is only called in another thread, and it works fine with the plain reactor and the wx reactor. Here is the example program (you should see 'TestThingy message' every 0.1 seconds or so..) Note that the bug report has two lines improperly indented. import time, sys from twisted.internet import gtk2reactor gtk2reactor.install() from twisted.python import threadable threadable.init() from twisted.internet import reactor from twisted.python import log log.startLogging(sys.stdout) class TestThingy: def __init__(self): print "TestThingy created" def run(self): print "TestThingy run" for i in range(10): print "TestThingy message" time.sleep(0.1) print "TestThingy done" class ThingyManager: def __init__(self): pass def submitThingy(self): log.err("ThingyManager submitting") f = TestThingy() log.err("ThingyManager created") reactor.callInThread(f.run) log.err("ThingyManager calledInThread") def ticker(*args): log.err("ticker: %d" % time.time()) reactor.callLater(1, ticker) t = ThingyManager() reactor.callLater(0, ticker) reactor.callLater(3, t.submitThingy) reactor.run() log.err("Reactor done") Dave