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can you explain more about "Can not be read" here? i didn't got your point about this issue :)
can not be read can be no text displayed or wrong font appears or wrong sentences or anything else :)
Explain with screenshoot will be great to help us know your issue exactly.. maybe you can ask your user to create screenshoot if you can't replicate it :)
When a user goes to their inbox if they click on any messages it goes to a 404 page and not to the read message page.
I have 404sef enabled with jomsocial setting set to use the joomla sef function
Can you try to disabled 404sef plugins and try again to click on any message on inbox ?
maybe you can provide you backend access because we can't check anything..
If I disable sef altogether, or enable 404sef with added custom urls either way seems to work, upgrading 404sef helped.
Wondering if there is a issue with default sef in joomla?
i think there is no issue with default SEF of joomla.. maybe you can ask about this into 404SEF developer or another SEF plugins developer do you use :)