SYMPTOM:
In Strategy Web 10.x, 'Permission denied' error occurs when running VI dashboard with text field, which is embedded in an iframe as shown in the image below:

STEPS TO REPRODUCE:

<iframe src="http://localhost/MicroStrategy/asp/Main.aspx?Server=server_name&Project=Strategy+Tutorial&Port=0&evt=3140&src=Main.aspx.3140&documentID=7E69E5F14AFD1C02EFE3A4ABFB0FFD2E" style="width:900;height:800;"> </iframe>
CAUSE:
This is a known issue with Strategy Web 10.x.
ACTION:
This issue has been addressed with Strategy 10.2. Upgrade to take advantage of the fix.
The Strategy Internal Reference Number for the issue discussed in this technical note is DE21079.