Sebastian Leupold wrote:
what are your cache settings? AFAIR, one of the module cache providers had been removed in DNN 5.x, which might cause issues after latest upgrade.
Performance settings in my host settings
Page State Persistence: Page
Module Cache Provider: Memory
Cache Setting: Heavy
Authenticated Cacheability: ServerAndNoCache
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in the Host Settings Module itself, I found it has an inherited Memory caching for 'Output Cache Provider', but when I looked into the caching on page level, it doesn't have any caching set. It's quite strange, every time I change Output Cache Provider to 'none specified', it changes itself back to "memory'.
Thanks very much for your help Sebastian.