I am installed AEM 126.96.36.199 service pack in AEM 6.4 server.
Now we are not able to open the crx de and not working.
What might be issue and what to do make it work.
Thanks in adavance.
Yesterday I installed 6.4.4 on 6.4 and did not see any issues.
Can you check error log if there are any exceptions and also check the memory is allocated correctly for the instance.
You will need to re-compile your code using 6.4.4 uber jar, and redeploy the package.
We recently upgraded to 6.4.4 from 6.4 did not see any issue.
Maybe your bundles are taking long time to start due to some dependencies.
check the error logs and also the release notes. AEM 6.4 Service Pack Release Notes