(sorry for bad english, i'm german)
maybe i can help with the error
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[phpBB Debug] PHP Notice: in file /includes/acp/acp_styles.php on line 2431: fread(): Length parameter must be greater than 0
i got this error too, when i was trying to remove the "jumpbox" from my portal-page (cause this box breaks my page-layout).
my way to remove this box, was f.e. to clear the "jumpbox.html" from all data, so my "jumpbox.html" have 0 Byte filesize.
THIS causes in may ACP the error.
to fix this problem i entered some Bytes in the "jumpbox.html", but just a notice
maybe you have ANY file with 0 Bytes filesize, and your error results from this.
try to find if you have such a file. if you have one, check out why
if it should be empty (f.e. from a reason i emtied my file), put notice like i did in the file.