Starting with the previous build, MetaTrader 4 for iPhone and iPad became compatible with iOS 8. The new version provides even more significant changes. 
Below are the three reasons why you should update your application right now:
- New MetaTrader 4 iOS  features improved financial news. Support 
for rich content allows you to receive important news in a timely manner
 with all the accompanying illustrations and videos. 
 
 
- The
 internal chat has been optimized, and its design has been improved. 
Now, all messages are synchronized at once rather than updating the 
dialogs one by one. 
 
 
- Support for the 64-bit architecture has been added increasing the 
application performance on the new Apple devices using A7 and A8 64-bit 
processors (starting with iPhone 5s and iPad Air).  

Update MetaTrader 4 iOS and try all the changes.