[support] messed up variable?

[Ursula Pieper]

I moved my sites to a different host (aside: VPS makes a big difference over
shared hosting!), and for one of the sites, I get this error message until
the cache is built, and then again after clearing the cache:

Notice: unserialize() [function.unserialize]: Error at offset 2 of 21 bytes
in variable_initialize() (line 749 of
myhomedirectory/www/includes/bootstrap.inc).

I searched the web, but didn't find anything that could help me.
Any suggestions on how to find the problem?
I am running drupal 7, and have listed the installed modules below.

Thanks, Ursula

Backup and Migrate  7.x-2.1            7.x-2.1           Up to date
Drupal core         7.0                7.0               Up to date
CAPTCHA             7.x-1.0-alpha2     7.x-1.0-alpha2    Up to date
Chaos tool suite    7.x-1.0-alpha4     7.x-1.0-alpha4    Up to date
Date                7.x-1.0-alpha2     7.x-1.0-alpha2    Up to date
Google Analytics    7.x-1.2            7.x-1.2           Up to date
Link                7.x-1.0-alpha3     7.x-1.0-alpha3    Up to date
Location Map        7.x-1.0            7.x-1.0           Up to date
Meta tags quick     7.x-1.2            7.x-1.2           Up to date
Page Title          7.x-2.4-beta1      7.x-2.4-beta1     Up to date
Pathauto            7.x-1.0-beta1      7.x-1.0-beta1     Up to date
Redirect            7.x-1.0-beta1      7.x-1.0-beta1     Up to date
Token               7.x-1.0-beta1      7.x-1.0-beta1     Up to date
Views               7.x-3.0-beta3      7.x-3.0-beta3     Up to date
Zen                 7.x-3.x-dev        7.x-3.x-dev       Up to date
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