Just filed as Issue #714 on bitbucket. I noticed that multiple input seems to be broken on workflows when selecting more that one file (a single file works). This is happening on our local instance, using Jan 27 galaxy-dist release, as well as both main/test.g2.bx.psu.edu Galaxy servers (latter sites just report a server error). Debugging output: URL: http://galaxy.igb.uiuc.edu/workflow/run?id=a799d38679e985db File '/home/a-m/galaxy/galaxy-dist/eggs/Paste-1.6-py2.6.egg/paste/exceptions/errormiddleware.py', line 143 in __call__ app_iter = self.application(environ, start_response) File '/home/a-m/galaxy/galaxy-dist/eggs/Paste-1.6-py2.6.egg/paste/debug/prints.py', line 98 in __call__ environ, self.app) File '/home/a-m/galaxy/galaxy-dist/eggs/Paste-1.6-py2.6.egg/paste/wsgilib.py', line 539 in intercept_output app_iter = application(environ, replacement_start_response) File '/home/a-m/galaxy/galaxy-dist/eggs/Paste-1.6-py2.6.egg/paste/recursive.py', line 80 in __call__ return self.application(environ, start_response) File '/home/a-m/galaxy/galaxy-dist/lib/galaxy/web/framework/middleware/remoteuser.py', line 111 in __call__ return self.app( environ, start_response ) File '/home/a-m/galaxy/galaxy-dist/eggs/Paste-1.6-py2.6.egg/paste/httpexceptions.py', line 632 in __call__ return self.application(environ, start_response) File '/home/a-m/galaxy/galaxy-dist/lib/galaxy/web/framework/base.py', line 160 in __call__ body = method( trans, **kwargs ) File '/home/a-m/galaxy/galaxy-dist/lib/galaxy/web/controllers/workflow.py', line 1458 in run update_only=True, old_errors=old_errors ) File '/home/a-m/galaxy/galaxy-dist/lib/galaxy/tools/__init__.py', line 1460 in update_state value, error = check_param( trans, input, incoming_value, context ) File '/home/a-m/galaxy/galaxy-dist/lib/galaxy/tools/parameters/__init__.py', line 60 in check_param param.validate( filtered_value, trans.history ) File '/home/a-m/galaxy/galaxy-dist/lib/galaxy/tools/parameters/basic.py', line 1547 in validate validator.validate( value, history ) File '/home/a-m/galaxy/galaxy-dist/lib/galaxy/tools/parameters/validation.py', line 185 in validate if value and value.missing_meta( check = self.check, skip = self.skip ): AttributeError: 'list' object has no attribute 'missing_meta' chris