Migrating g1>g2: "The path that you entered is invalid."

I have spent the day reading the forums, docs, and faqs, but am having trouble using Import->Gallery 1 to migrate some albums from G1 into G2. I'm getting the following error from Import->Gallery 1: "The path that you entered is invalid."

I am using the albumDir that is listed in my g1 config.php, "/sites/www.horie.us/web/albums", (which the path field autocompletes correctly in the import module, BTW). Pressing select gets the error "The path that you entered is invalid."

I've reffered to http://codex.gallery2.org/Gallery2:migration, and checked my G1 installation by uploading a test image. It seemed to work fine, except that the thumbnail was not created. Find orphans and validate albums did not return errors.

I am also having trouble configuring then URL rewrite module.
Under Setup->Apache mod_rewrite, automatic detection does not find mod_rewrite. When I try to run the tests manually , I get a "Forbidden. You do not have permission to access the requested file on this server" message. I do not have admin access to the apache server. From post http://gallery.menalto.com/node/39351 , I checked my info.php
and can see that there are no values in open_basedir, although I am not familiar with what this indicates.

I do not know if mod_rewrite is causing the problem, and I am not sure exactly what should appear in the G1 and G2 .htaccess files. I was wondering if it is possible to use the PHP Path Info method instead of Apache mod_rewrite, although I also do not know how to configure it correctly. Any detailed suggestions on properly configuring either methds would be most appreciated.

thanks,
Chris

G2 URL (optional): http://www.horie.us/gallery/
G2 version: 2.2.2 core 1.2.0.3
G1 URL (optional): http://www.horie.us/g1/
G1 version:1.5
G1 character set:
PHP memory limit:
--
PHP version (e.g. 5.1.6):4.4.4 cgi-fcgi
PHPInfo Link (see FAQ): http://www.horie.us/gallery/info.php
Webserver (e.g. Apache 1.3.33): Apache/2.0.59 (FreeBSD) PHP/4.4.4 with Suhosin-Patch RAQdevil/1.0 mod_ssl/2.0.59 OpenSSL/0.9.7e-p1
Database (e.g. MySql 5.0.32): mysql 5.0.27
Activated toolkits (e.g. NetPbm, GD): none
Operating system (e.g. Linux): FreeBSD 6.2
Browser (e.g. Firefox 2.0): Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.12) Gecko/20070508 Firefox/1.5.0.12

UPDATE: The website administrator recently performed some maintenance, although on what applications, I am not sure. Migration seems to be working fine now. I do not know what the original cause was, but I am happy to be using Gallery 2 again. Thanks jmullen for your response.