Hi,
after update to Joomla 5.1.0 Admin Tools told me "Your server config file may need to be rebuilt." When klicked regenerate the and had reloaded the site the menu unter "Home Dashboard" do work anymore and some other icons too.
Restoring the last .htaccess has fixed the problem. Comparing the old an the new .htaccess shows some differences at line 345 f. und 368 f.
For example line 345 f.
old
# Serve correct content types, and prevent double compression.
RewriteRule "\.css\.br$" "-" [T=text/css,E=no-gzip:1,E=no-brotli:1]
RewriteRule "\.js\.br$" "-" [T=text/javascript,E=no-gzip:1,E=no-brotli:1]
new
# Serve correct content types, and prevent double compression.
RewriteRule "\.css\.br$" "-" [E=no-gzip:1]
RewriteRule "\.css\.br$" "-" [T=text/css,E=no-brotli:1,L]
RewriteRule "\.js\.br$" "-" [E=no-gzip:1]
RewriteRule "\.js\.br$" "-" [T=text/javascript,E=no-brotli:1,L]
I have checked this also on Jommla 4.4.4 with php 8.2.16 an 8.3.6 and got alwas the sam problem.
Perhaps this behavior depends on my providers configuration but maybe there is another reason that depends on the new Joomla.
Regards, Achim