After upgrading to 7.x-1.0-beta10, I ran into the following error when saving any content that used a content type that had the field_collection type utilized.
Warning: array_filter() expects parameter 1 to be array, string given in field_collection_item_is_empty()
The server for the website I noticed the issue on is using PHP 5.6 (also is running on Windows Server if that makes any difference). For right now I reverted to the prior versions code for that particular block and it seems to be working as expected.
Even with the error, it didn't see to cause any issues with saving and updating the data though, from what I could see.