I am seeing this same issue under 10.10 with kernel 2.6.35-22-generic.
This is running on a standard Sun Ultra 27 Workstation.
Using a SanDisk U3 Titanium USB stick in this case, but it happens with
all my USB hard drives.
Details from syslog follow.
Oct 28 11:45:31 burra kernel: [249424.002680]
I was experiencing something similar, bugged me for the past few days.
Manual configuration allowed me to see wireless options but right
clicking on the network-manage applet did not show the enable wireless
option and no wireless networks were visible. nm-tool showed no details
for my wireless int