Folder protection problem

I've been running aMember for over a year on my existing server but am now migrating to a new hosting company and have run into a problem with aMember. Specifically, when I click the 'Protect Another Folder' link, nothing happens; i.e. aMember seems to freeze and renders the rest of the control panel inoperable. The only way I can re-access it is to log out using a different browser. I've run tester.php, and it reports the following:

Code:

Testing whether your system has ionCube Loader in php.ini...OK
Testing results:
No additional configuration required and aMember will work on your hosting using the following loading method: ionCube Loader installed

Additional information:
PHP version 	5.1.6 (apache2handler)
OS 	Linux 179703-www1.chromasia.com 2.6.18-92.1.6.el5 #1 SMP Fri Jun 20 02:36:06 EDT 2008 x86_64
safe_mode 	Disabled
enable_dl 	Enabled
extension_dir 	/usr/lib64/php/modules
PHP Extensions 	libxml, xml, wddx, sysvshm, sysvsem, sysvmsg, SimpleXML, sockets, SPL, shmop, Reflection, pspell, posix, mime_magic, iconv, hash, gmp, gettext, ftp, exif, date, curl, ctype, calendar, bz2, zlib, openssl, apache2handler, dbase, dom, gd, imap, mbstring, mysql, mysqli, PDO, pdo_mysql, pdo_sqlite, SQLite, xmlreader, xmlwriter, xsl, ionCube Loader
CURL binary 	/usr/bin/curl

Also, there are no errors in either the aMember logs or my server logs.

I've raised a ticket, and am waiting to hear back, but in the meanwhile I wondered if anyone else had experienced the same problem or could suggest anything I could try to fix this? I suspect that I could generate the .htaccess files manually for new products, but am worried about activating my new server when I know there's a problem with this installation.

Best wishes,

Dave