I cannot get W3 Total Cache to work on my Wordpress site

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When I attempt to install the W3 Total Cache plugin on my wordpress site, I get a variety of errors including the following: FTP credentials don't allow to write to file /.htaccess I have manually modified the .htaccess file as instructed, but the plugin continues to suggest the following manual modification: # BEGIN W3TC Page Cache core RewriteEngine On RewriteBase /~acainc5/ RewriteRule ^(.*\/)?w3tc_rewrite_test/?$ $1?w3tc_rewrite_test=1 [L] RewriteCond %{HTTP:Accept-Encoding} gzip RewriteRule .* - [E=W3TC_ENC:_gzip] RewriteCond %{HTTP_COOKIE} w3tc_preview [NC] RewriteRule .* - [E=W3TC_PREVIEW:_preview] RewriteCond %{REQUEST_METHOD} !=POST RewriteCond %{QUERY_STRING} ="" RewriteCond %{REQUEST_URI} \/$ RewriteCond %{HTTP_COOKIE} !(comment_author|wp\-postpass|w3tc_logged_out|wordpress_logged_in|wptouch_switch_toggle) [NC] RewriteCond "%{DOCUMENT_ROOT}/home/acainc5/public_html/wp-content/cache/page_enhanced/%{HTTP_HOST}/%{REQUEST_URI}/_index%{ENV:W3TC_PREVIEW}.html%{ENV:W3TC_ENC}" -f RewriteRule .* "/home/acainc5/public_html/wp-content/cache/page_enhanced/%{HTTP_HOST}/%{REQUEST_URI}/_index%{ENV:W3TC_PREVIEW}.html%{ENV:W3TC_ENC}" [L] # END W3TC Page Cache core I have also tried modifying permissions on the .htaccess file to 666. Nothing seems to make any difference. Any suggestions would be appreciated.
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Scott
Hello,

What version of WordPress are you using? Did you try to use it on a different version before? If so, was the behavior present then? What plugins do you have enabled? Have you tried disabling all other plugins?

Kindest Regards,
Scott M