.httacces duda en configuracion

[Calderay]

Yo entré a este foro para consultar unas dudas que tenia... y acabo contestando ¬¬

Mi htaccess es algo asi:

# =================================================
Options +FollowSymLinks

# asegurar htaccess
<Files .htaccess>
order allow,deny
deny from all
</Files>

RewriteEngine on
#redirijo a HTTPS
RewriteCond %{SERVER_PORT} 80
RewriteRule (.*) https://www.midominio.com/$1 [R=301,L]

#ERRORES
ErrorDocument 400 error404.php
ErrorDocument 500 error500.php

#MENU PRINCIPAL
RewriteRule ^colchones.html$ colchones-baratos.php?familia=8 [L]
RewriteRule ^somires-y-bases-tapizadas.html$ colchones-baratos.php?familia=9 [L]
RewriteRule ^canapes.html$ colchones-baratos.php?familia=10 [L]
RewriteRule ^canapes$ colchones-baratos.php?familia=10 [L]

#COLCHONES VARIOS
RewriteRule ^colchones-muelles.html$ colchones-baratos.php?familia=7&subfamilia=79 [L]
RewriteRule ^colchones-viscoelastica.html$ colchones-baratos.php?familia=7&subfamilia=8 [L]

#ARTICULO
RewriteRule ^articulo_([0-9]+)\.html$ articulo.php?id=$1 [L]
# =================================================

Estas seguro que la url: "index.php?action=compras" es correcta?
y la linea "RewriteRule ^compras.html$ index.php?action=compras [L]" no te va??

prueba algo mas sencillo, como:
RewriteRule ^loquesea.html$ index.php [L]