Open trading account 
The following solution is not mine. Full credit goes to Jason Rogers. I'm copy & pasting and paraphrasing a little.
Problem: MT4 bridge to JForex no longer works properly.
Why?: There's a new MT4 build 600.
Solution:
1. First, find where you have your MT4 files saved currently.
2. Open MT4 > click on File > Open data folder > then double click the MQL4 folder. This will show you where your experts, indicators, etc. should be saved on your computer. Unless you have UAC settings disabled the folder location will beC:\Users\[user name]\AppData\Roaming\MetaQuotes\Terminal\[32 character long MT4 ID]\MQL4
3. Copy the files from the old location to the new location. For your EA's, for example, you will copy the contents of theC:\Program Files (x86)\Your Broker MetaTrader 4\experts folder to C:\Users\[user name]\AppData\Roaming\MetaQuotes\Terminal\[32 character long MT4 ID]\MQL4\Experts
Problem: MT4 bridge to JForex no longer works properly.
Why?: There's a new MT4 build 600.
Solution:
1. First, find where you have your MT4 files saved currently.
2. Open MT4 > click on File > Open data folder > then double click the MQL4 folder. This will show you where your experts, indicators, etc. should be saved on your computer. Unless you have UAC settings disabled the folder location will beC:\Users\[user name]\AppData\Roaming\MetaQuotes\Terminal\[32 character long MT4 ID]\MQL4
3. Copy the files from the old location to the new location. For your EA's, for example, you will copy the contents of theC:\Program Files (x86)\Your Broker MetaTrader 4\experts folder to C:\Users\[user name]\AppData\Roaming\MetaQuotes\Terminal\[32 character long MT4 ID]\MQL4\Experts
