Cannot save module changes after update to j3.8.10

When i try to save changes in the slideshow ck module it redirects to the module list and the specific module is locked (checked in). The changes are not being saved,
This happens after updating Joomla to 3.8.10.
Slideshow ck version 1.4.54

Hi
how many images are you loading in the slides manager ?
CEd

82 - i am trying to delete them but i cannot. It keeps redirecting to the module list.

this is a problem where the sql string is truncated
try to create a new slideshow module and copy the settings like in the other module. Just don't put so much slides and try if it works
if yes then you can edit your database to update the "params" field in the "modules" table from type "text" to "longtext" to avoid this to happen again