I had a script which updates workitems. It worked fine in RTC 1.0.1.
After upgrading to RTC 2.0 and rebuilding against 2.0 libraries, In some cases the save fails.
I don't get any exception during the script running and it seems that the save succeeded, but looking at the WI in RTC later shows no modification.

Here is my code:

// get work item copy
IWorkItemHandle handle = (IWorkItemHandle) workItem.getItemHandle();
IWorkItemWorkingCopyManager wcm = workitemClient
.getWorkItemWorkingCopyManager();
wcm.connect(handle, IWorkItem.FULL_PROFILE, monitor);
WorkItemWorkingCopy wc;

wc = wcm.getWorkingCopy(handle);
IWorkItem copiedWorkItem = wc.getWorkItem();
// end get work item copy

// change status
IAttribute stateAttribute = workitemClient.findAttribute(
projectArea, IWorkItem.STATE_PROPERTY, null);

copiedWorkItem.setValue(stateAttribute, resolvedState
.getStringIdentifier());
// end change status
.
.
.

wc.save(monitor);

Thanks,
Moti