You don't say what version you are running or what the previous version was.
Since the kernel has not changed since 3.0, I doubt the version has anything to do with the problem.
I would look for changes in the extensions you are loading.
Thanks Gerald for your reply,
ossinfo output
OSS4.2 (b2002/201005121103)
Platform: linux/i686 2.6.33.3 tinycore
Number of audio device: 0
Number of audio engines: 0
Number of midi device: 0
Number of mixer device: 0
device objects
0: osscore0 osscore service
1:oss_usb 0 usb audio core service
midi devices (/dev/midi *)
mixer devices
audio devices
Nodes
ossxmix was installed through app browser.