Ok, I can fairly accurately reproduce this error. Install the extension, changing the settings accordingly. Create new MSM site, and go into the extension settings for that site, you will note that firstly, the settings here are default; not reflecting the changes you made for the ‘master’ site. Anyway, you don’t even need to change anything here, just hit save/submit.
Notice: unserialize() [function.unserialize]: Error at offset 44972 of 65535 bytes in /path/to/system/extensions/ext.lg_tinymce.php on line 1097
Notice: unserialize() [function.unserialize]: Error at offset 44972 of 65535 bytes in /path/to/system/core/core.extensions.php on line 218
The serialized string, for all hooks, as saved in the database will now not unserialize, it’s fubar’d;
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