I'm afraid I dont see any problem with Sideview 2.7 running on Splunk 5.0.5.
Can you tell me what browser and browser version you're using?
Have you restarted Splunk after the Sideview Utils upgrade?
Also, I would try clearing your browser cache and see if that fixes the issue.
Also the linking2_tables view in Sideview Utils actually doesn't use Splunk's SimpleResultsTable module, it uses the Sideview Table module. I just noticed that the text of the documentation on that page is a bit inconsistent - in one place it implies that the example on the page is using SimpleResultsTable, and in other place it refers to it as a Table module. I will fix that inconsistency.
Yea it sounds like Sideview Utils didn't get installed all the way. Maybe you didn't restart Splunk after the upgrade or maybe there had been manual permissions and file ownership changes made on disk such that it disrupted the upgrade later? In such cases you can end up with a frankenstein build where some parts are new and some parts are old. The bugs resulting from such a problem might be subtle or might be very dramatic.