Odd issue with SeasideForWebToolkit bundle (2.6b1.58.0)

I tried re-loading SeasideForWebToolkit (2.6b1.58) from a vanilla VW
7.4nc image and get the following error after it gets installed and I
try bringing up the counter (or any other) Seaside page :

Message not understood: #addMetaContentType

If I go back to the prior version (2.6b1.45.0), the problem disappears..
   Anyone else see this?

-- Rick
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