I thought I'd give this a try as well. I was unable to replicate your reported bug in both an older version of Jaxx (1.3.3), the latest version of Jaxx (1.3.18) and in Jaxx Liberty (2.0.1.0). All versions returned private keys in the standard 52-character compressed WIF format, starting with X. I was able to send balance, import the privkeys in Dash Core and see the balance imported with no issues at all.
I think what moocowmoo is asking here is to help us understand how you are exporting keys that start with L or K. A partially blurred screenshot and/or a specific version number and platform would be very helpful for us to try and replicate your problem. Until you do so, we have to assume user error or a corrupt Jaxx installation is also a possible explanation for this. Are you sure you aren't looking at the keys for another coin? I'm happy to have a look at the keys for you in PM - several users here can attest to me having helped them in the past with wallet recovery.
I think what moocowmoo is asking here is to help us understand how you are exporting keys that start with L or K. A partially blurred screenshot and/or a specific version number and platform would be very helpful for us to try and replicate your problem. Until you do so, we have to assume user error or a corrupt Jaxx installation is also a possible explanation for this. Are you sure you aren't looking at the keys for another coin? I'm happy to have a look at the keys for you in PM - several users here can attest to me having helped them in the past with wallet recovery.