I installed umbrello 1.5.6 using synaptic on Feisty. I was having the same 99% CPU usage problem and was also getting exactly the same error messages.
When looking at the file umbrello was saving I noticed it had nearly 28000 lines exactly the same containing the following <UML:Stereotype isSpecification="false" isLeaf="false" visibility="public" namespace="m1" xmi.id="62" isRoot="false" isAbstract="false" name="datatype" /> After deleting all the duplicates umbrello was working fast again and the filesize had reduced from 4.4MB to 170KB I still get the error messages and it still keeps making the duplicates but I figure regularly deleting the duplicate lines is quicker than finding an alternative to umbrello. Hope this helps -- umbrello 1.5.6 using 99% of CPU on Feisty https://bugs.launchpad.net/bugs/120208 You received this bug notification because you are a member of Kubuntu Team, which is a bug contact for kdesdk in ubuntu. -- kubuntu-bugs mailing list [EMAIL PROTECTED] https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs