File uploads stuck in loop (keeps resetting)

[MadHatter]

Hi,

We've just recently moved a ProcessWire site from our development server to its new location and seem to be running into an issue with uploading large files. After a while (we've timed it at 30 seconds) the upload resets to 0% and then starts again. We figured that it must be a php/apache issue so we added in a few extra settings in our .htaccess file

<IfModule mod_php5.c>
	php_value max_execution_time 200
	php_value max_input_time 200

	php_value upload_max_filesize 300M
	php_value post_max_size 300M

	php_value memory_limit 512M
</IfModule>

Despite these changes (which we confirmed using phpinfo()) we still cannot seem to get the uploads to go past a certain point. What other issues could be causing this? I wondered if our /tmp directory needed to be bigger but as the files are only 10MB or so I'm doubtful that this would be the issue.

Has anyone else encountered a similar issue?