I did a Dash transaction and now my Dash balance shows as 3e-8 (or similar). What is going on?

The dash balance of Xe-8 (where X is a number value) is a display issue. Essentially it means that your balance currently holds a small amount of funds. Xe-8 = 0.0000000X Dash (5e-8 = 0.00000005 Dash, 2e-8 = 0.00000002 Dash etc.) 

To solve this display issue, simply do a cache reset