hop of those help? I've been doing a little research into this and whilst I'm not entirely sure its the cause I believe it is because Safari is not returning the full result set (hence cropping it). I have been in dicussion with another developer and found the following post on Channel 9 as well which recommends making use of the SQL State service to store the viewstate avoiding the postback issue and also page size.
TinyMCE and Viewstate verification failed. Reason: Viewstate was invalid
By : Webpromedya
Date : March 29 2020, 07:55 AM