User Edit Page Freezes / Bad Response. Got This: Warning: strtotime() expects parameter 1 to be string, array given

Hey everyone,

When registering a new user or updating a user's profile information, it's sometimes causing my user edit pages and site registration page to be inaccessible on a site-wide basis for 15-30 minutes. Likewise, in my Mailchimp account it's causing the Lists section of my account to be inaccessible for the same amount of time. Basically, the pages continually try to load, but can't. The only remedy has been to turn off the Mailchimp module and give it some time to reset.

Note that I've set the options to have Mailchimp newsletter subscription info included on the site registration page and the user edit page. I'm also updating Mailchimp immediately as opposed to waiting for cron to run.

Additionally, I'm getting the following error in my log messages:

Bad Response. Got This:
Warning: strtotime() expects parameter 1 to be string, array given in /var/web3chroot/mailchimp/home/mailchimp/4.2.0/app/models/List/Merge.php on line 298
b:1;

This appears to be related to sending a "Date" profile field to a Mailchimp "date" field. In my case, I have users submit their birthday. Although this field can be successfully transferred to mailchimp upon registration, in some instances when registering or updating that field on the user edit page, it causes the above error message. When this error occurs the following date "01/01/1970" shows up in the field on my mailchimp account.

Any ideas as to the cause?

Thanks,
Ben