vBSEO + page 'uses an invalid or unsupported form of compression'
 

UPDATE: See 4th post for solution.
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A fresh install of vBSEO, on a vBulletin 3.x board with GZIP enabled in the admincp vB Option, on a Windows 2008 IIS 7 server, using Micronovae IIS Mod-Rewrite, generates this message:
Prior to vBSEO, the vB GZIP worked fine. It seems that either vBSEO adds it's own GZIP, or something about this vB + vBSEO combination don't properly cooperate with IIS and/or Micronovae software.

.htaccess + web.config had also previously been coexisting without issue.

Removing the .htaccess file completely seems to have resolved the compression issue.

Will watch for further problems.

Disabling GZIP entirely was also a solution, although undesirable.

Actually.... it may have been related to the Zoints SEO plugin for vBulletin.
On a vB 3.8.x forum, Zoints seems to work fine in conjuction with vBSEO, with the Zoints rewrite turned off.
The other features still function.

On a vB 3.7.x forum, however, there was corruption in the compression output. Disabling Zoints entirely seems to have corrected the issue.

GZIP is enabled.
.htaccess restored, although some ruled purged or cleaned up.

Strange. :(

I may have to test settings within Zoints, to see if it's a specific feature that conflicts, or the whole plugin.

Nope. Reintroducing a basic .htaccess barfed with this rule:
More output compression errors thrown by the web browser.

More to test. :(

This did the trick:

1. Disable gzip setting within vBulletin, as server has dynamic + static compression enabled in IIS.
2. Disable URL rewrite in Zoints (but feel free to leave enabled for other features)

3. And reset MySQL to flush its cache. :thumb: