This looks like a good one for our support team. If possible send a screen shot of the error and the packaged workbook (twbx file) that is causing the issue to firstname.lastname@example.org
The development organization at Tableau has also seen this issue, or at least one that has the same symptom. The one we saw was triggered by a combination of a parameter that holds strings, a slider for that parameter on a dashboard, and viewing the viz on a mobile device.
If your problem is the same one we saw, the simplest workaround is to change the parameter control from a slider to a drop-down. The next simplest is to rework your viz to have the parameter be a number.
We have a fix in the works and you can expect it in the first maintenance release release to Tableau 8.
- Austin Dahl