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s$ more fatal.log 
[11-Feb-2014 01:02:09] Fatal error: Call to undefined method Flow\Model\UUID::getAlphadecimal() at /data/project/apache/common-local/php-master/extensions/Flow/includes/R
epository/MultiGetList.php on line 26
Server: i-0000031a
Method: POST
URL: http://en.wikipedia.beta.wmflabs.org/w/api.php
Cookie: centralnotice_bucket=1-4.2; uls-previous-languages=%5B%22en%22%5D; mediaWiki.user.sessionId=tliSO17WjN2yv5bXUSsz3t2fTiXffa3b
Backtrace:
#0 /data/project/apache/common-local/php-master/extensions/Flow/includes/Repository/MultiGetList.php(26): Flow\Repository\MultiGetList->get()
#1 /data/project/apache/common-local/php-master/extensions/Flow/includes/Repository/TreeRepository.php(304): Flow\Repository\MultiGetList->get(Array, Array, Array)
#2 /data/project/apache/common-local/php-master/extensions/Flow/includes/Data/RootPostLoader.php(183): Flow\Repository\TreeRepository->fetchSubtreeNodeList(Array)
#3 /data/project/apache/common-local/php-master/extensions/Flow/includes/Data/RootPostLoader.php(77): Flow\Data\RootPostLoader->fetchRelatedPostIds(Array)
#4 /data/project/apache/common-local/php-master/extensions/Flow/includes/Data/RootPostLoader.php(68): Flow\Data\RootPostLoader->getMulti(Array)
#5 /data/project/apache/common-local/php-master/extensions/Flow/includes/Block/Topic.php(860): Flow\Data\RootPostLoader->get(Object(Flow\Model\UUID))
#6 /data/project/apache/common-local/php-master/extensions/Flow/includes/Block/Topic.php(367): Flow\Block\TopicBlock->loadRootPost()
#7 /data/project/apache/common-local/php-master/extensions/Flow/includes/WorkflowLoader.php(216): Flow\Block\TopicBlock->commit()
#8 /data/project/apache/common-local/php-master/extensions/Flow/includes/api/ApiFlow.php(59): Flow\WorkflowLoader->commit(Object(Flow\Model\Workflow), Array)
#9 /data/project/apache/common-local/php-master/includes/api/ApiMain.php(861): ApiFlow->execute()
#10 /data/project/apache/common-local/php-master/includes/api/ApiMain.php(362): ApiMain->executeAction()
#11 /data/project/apache/common-local/php-master/includes/api/ApiMain.php(333): ApiMain->executeActionWithErrorHandling()
#12 /data/project/apache/common-local/php-master/api.php(76): ApiMain->execute()
#13 /data/project/apache/common-local/w/api.php(3): require('/data/project/a...')
#14 {main}

This may not be important, but noting it just in case: