[Android Q&A, Help & Troubleshooting] _Man0waR_:
I have some bad news regarding this bug. I managed to reproduce it already on some LP roms. I know it is very early and most roms are in 'alpha' state. However on my OnePlus One device, I tried two different roms and two apps known for having the issue on Jellybean:

(Skysafari and Imperia Online v6).

// Roms tested:

- http://xdaforums.com/oneplus-one/development/daily-stock-unofficial-cm12-builds-t2948099

- http://xdaforums.com/oneplus-one/development/rom-cm11-temasek-build-t2870743

On the 'stock unofficial' CM12 everything is good. Both apps are working fine.

On 'Temasek' build (which is based on CM12 but with some 'extra' commits/features from different roms), the issue is there.

No issues with Skysafari on 'stock' Nexus 4 and N7 (2013).

Anyway, I started to look at the logs and the error is a bit different. (But the issue is similar apparently, the obb cannot be mounted). There are a few interesting things though:

// Skysafari

I/ActivityManager( 867): START u0 {cmp=com.simulationcurriculum.skysafari4pro/com.southernstars.skysafari.SkySafariActivity} from uid 10082 on display 0
I/System.out( 4954): onCreate: com.southernstars.skysafari.SkySafariActivity
I/System.out( 4954): OBB is Readable
I/System.out( 4954): OBB is Writable
D/STORAGE_MNT( 4954): MOUNT SUCCESSFULLY QUEUED
W/ContextImpl( 867): [B]Calling a method in the system process without a qualified user[/B]: android.app.ContextImpl.bindService:1757 com.android.server.MountService$ObbActionHandler.connectToService:2761 com.android.server.MountService$ObbActionHandler.handleMessage:2640 android.os.Handler.dispatchMessage:102 android.os.Looper.loop:135
...
I/SkySafari( 4954): Path to obb:
I/SkySafari( 4954): Path to assets: /storage/emulated/0/Android/data/com.simulationcurriculum.skysafari4pro/files/
I/SkySafari( 4954): Creating CSkyChart
I/SkySafari( 4954): Finished nativeInit.
E/Vold ( 257): Failed to find mounted volume for /storage/usbdisk/Android/data/com.simulationcurriculum.skysafari4pro/files/
W/Vold ( 257): Returning OperationFailed - no handler for errno 0

//Imperia Online V6

D/ObbExpansionManager( 5411): Checking if /storage/emulated/0/Android/obb/org.imperiaonline.android.v6/main.70.org.imperiaonline.android.v6.obb mounted after 300ms...
W/ObbExpansionManager( 5411): Mount not queued. Retry...
W/ContextImpl( 867): Calling a method in the system process without a qualified user: android.app.ContextImpl.bindService:1757 com.android.server.MountService$ObbActionHandler.connectToService:2761 com.android.server.MountService$ObbActionHandler.handleMessage:2640 android.os.Handler.dispatchMessage:102 android.os.Looper.loop:135
D/ObbExpansionManager( 5411): Mount state: 20
D/ObbExpansionManager( 5411): Checking if /storage/emulated/0/Android/obb/org.imperiaonline.android.v6/main.70.org.imperiaonline.android.v6.obb mounted after 300ms...

I hope this will be useful and rom developers will finally be able to fix this issue. More tests need to be done on different roms/devices. However I thought it would be a good idea to mention early, before more and more features are added to custom roms.

[edit]

I tested the latest build of AICP rom and contrary to JB the issue is not present on LP !