Hello. OK, so you are using an Arduino 101. Same issue then, sorry, it was hard to tell at first. Been seeing a few 101 questions mixed in with other BT/BLE issues.
Turns out there is a bug on Arduino’s / Intel’s end, that is preventing Blynk BLE from working properly with the updated 101 core libraries… or something like that.
“They”, Intel and Arduino, are aware of the issue. Unfortunately, I believe all 101 users will just have to wait until Intel releases the next update to the IDE.