Recently I have bought the license to upgrade X theme as well as cornerstone. After upgrading to the latest version, whenever I try to edit a page. It will shows this error. " The preview was unresponsive after loading. This is most often related to a plugin template or aggressive page caching." My website were working fine when I was still using the old version of cornerstone.
Another error is "Uh oh, the preview HTML did not include a closing tag. It may fail to load or work properly.
Both errors did not occur during the old version of cornerstone or x theme.
Last but not least is that, I cant seems to preview or work on the new elements that is on the latest version of X theme and cornerstone. I can only use on the classic elements. The new elements did not "show" up in the preview even though I have insert it on a blank new page.
Please kindly advise what should I do to prevent all the errors above as well as how can I use the new elements in cornerstone.