Question: How many additional database queries are required by this add-on?

zero

Great. That's what I thought I was seeing but I wasn't sure how it was possible to determine the device being used without additional queries. :)

Oh, of course. Just a simple if... then. :o

Nice update. thanks.

Still got the same problem, and it's also being reported on the LG Secret too.

Considering it worked on the older version, I'm thinking the only way to make the style fully switchable (without problems) is with a custom profile option and a conditional to turn off the useragent detection ... I did try the following:

if ($vbulletin->options['mob_detect_enabled'] == 1 AND $bbuserinfo['fieldxx'] == "On")

but that just killed the plugin completely.

You would be after:
The confusing thing with this issue you are having is that it detects and assigns the style initially, but then presents with default subsequently - I'm not sure how it could do that based on what you are reporting.

I'm a bit stumped too, I haven't got any access to different brands of phone to see if it's user error or not.

I'll try your conditional and see if that works, in the meantime I've gone back to the 3.8 plugin. :)

Hmm, that conditional is just getting ignored :S