The same thing happening to me, I cant create cards says there is an error on the database using the default theme....Nothing in the logs
There are some problems with your database. Normally it is safe to try to fix these problems automatically however if your community is large, you may want to run the necessary queries manually. If so, the queries to run are:
ALTER TABLE `core_groups` CHANGE COLUMN `g_stratagem_copy_projects` `g_stratagem_copy_projects` TINYINT UNSIGNED NOT NULL
ALTER TABLE `core_groups` CHANGE COLUMN `g_stratagem_copy_projects` `g_stratagem_copy_projects` TINYINT UNSIGNED NOT NULL