Hi, thanks for your reply - yes I have completely removed it and tried again. Here is the full stack trace (I've anonomized it):
[Mon Sep 23 10:11:15 2013] [error] PHP Fatal error: Call to undefined method SplFileInfo::getRelativePath() in /current/wp-content/plugins/tubepress/vendor/ehough/finder/src/main/php/ehough/finder/iterator/ExcludeDirectoryFilterIterator.php on line 44, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP Stack trace:, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 1. {main}() /current/wp-admin/plugins.php:0, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 2. activate_plugin() /current/wp-admin/plugins.php:40, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 3. include_once() /current/wp-admin/includes/plugin.php:537, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 4. include() /current/wp-content/plugins/tubepress/tubepress.php:19, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 5. bootTubePress() /current/wp-content/plugins/tubepress/src/main/php/scripts/boot.php:48, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 6. tubepress_impl_boot_PrimaryBootstrapper->boot() /current/wp-content/plugins/tubepress/src/main/php/scripts/boot.php:37, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 7. tubepress_impl_boot_PrimaryBootstrapper->_07_discoverAddons() /current/wp-content/plugins/tubepress/src/main/php/classes/tubepress/impl/boot/PrimaryBootstrapper.php:121, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 8. tubepress_impl_boot_DefaultAddonDiscoverer->findAddons() /current/wp-content/plugins/tubepress/src/main/php/classes/tubepress/impl/boot/PrimaryBootstrapper.php:248, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 9. tubepress_impl_boot_DefaultAddonDiscoverer->_discoverAddonsFromFilesystem() /current/wp-content/plugins/tubepress/src/main/php/classes/tubepress/impl/boot/DefaultAddonDiscoverer.php:48, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 10. tubepress_impl_boot_DefaultAddonDiscoverer->_findSystemAddons() /current/wp-content/plugins/tubepress/src/main/php/classes/tubepress/impl/boot/DefaultAddonDiscoverer.php:104, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 11. tubepress_impl_boot_DefaultAddonDiscoverer->_findAddonsInDirectory() /current/wp-content/plugins/tubepress/src/main/php/classes/tubepress/impl/boot/DefaultAddonDiscoverer.php:120, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 12. ehough_finder_iterator_FilterIterator->rewind() /current/wp-content/plugins/tubepress/src/main/php/classes/tubepress/impl/boot/DefaultAddonDiscoverer.php:156, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 13. FilterIterator->rewind() /current/wp-content/plugins/tubepress/vendor/ehough/finder/src/main/php/ehough/finder/iterator/FilterIterator.php:46, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 14. ehough_finder_iterator_FilterIterator->rewind() /current/wp-content/plugins/tubepress/vendor/ehough/finder/src/main/php/ehough/finder/iterator/FilterIterator.php:46, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 15. FilterIterator->rewind() /current/wp-content/plugins/tubepress/vendor/ehough/finder/src/main/php/ehough/finder/iterator/FilterIterator.php:46, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 16. ehough_finder_iterator_FilterIterator->rewind() /current/wp-content/plugins/tubepress/vendor/ehough/finder/src/main/php/ehough/finder/iterator/FilterIterator.php:46, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 17. FilterIterator->rewind() /current/wp-content/plugins/tubepress/vendor/ehough/finder/src/main/php/ehough/finder/iterator/FilterIterator.php:46, referer: https://site.com/wp-...once=650f44d112
[Mon Sep 23 10:11:15 2013] [error] PHP 18. ehough_finder_iterator_ExcludeDirectoryFilterIterator->accept() /current/wp-content/plugins/tubepress/vendor/ehough/finder/src/main/php/ehough/finder/iterator/FilterIterator.php:46, referer: https://site.com/wp-...once=650f44d112