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My family and I have logged a lot of hours on this save, so any help would be appreciated. Please tell me how I can recover this save...

Events leading up to problem:

I tried to install a texture pack: LB Photo Realism by copying the extracted zip files into the resource file. The texture never loaded as an option. I deleted the texture files from the resource folder.

I loaded my game and played. Everything was normal. I exited and saved normally.

I tried to play again. The save crashed. All other saves crashed. New games crashed.

I copied and backed up the save I wanted to keep and still have it.

Things I've tried:

1) Uninstalled MC, deleted .Minecraft file, reinstalled. This allowed new saves to work but old save still crashes.

2) Replaced the following files on a new save with my old save versions. Still crashed. Suggested by minecraft.gamepedia.com

• level.dat
• level.dat_old
• level.dat_mcr (not always present)
• session.lock

3) Other suggestions?

Here is the crash log:


---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 8/8/15 10:47 AM
Description: Updating screen events

java.lang.RuntimeException: Failed to check session lock, aborting
at atm.h(SourceFile:49)
at atm.<init>(SourceFile:35)
at atj.<init>(SourceFile:19)
at atk.a(SourceFile:78)
at ave.a(SourceFile:1901)
at axv.i(SourceFile:172)
at axv.a(SourceFile:135)
at axu.a(SourceFile:350)
at axu.k(SourceFile:413)
at axv.k(SourceFile:81)
at axu.p(SourceFile:390)
at ave.s(SourceFile:1498)
at ave.av(SourceFile:889)
at ave.a(SourceFile:325)
at net.minecraft.client.main.Main.main(SourceFile:124)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at atm.h(SourceFile:49)
at atm.<init>(SourceFile:35)
at atj.<init>(SourceFile:19)
at atk.a(SourceFile:78)
at ave.a(SourceFile:1901)
at axv.i(SourceFile:172)
at axv.a(SourceFile:135)
at axu.a(SourceFile:350)
at axu.k(SourceFile:413)
at axv.k(SourceFile:81)
at axu.p(SourceFile:390)

-- Affected screen --
Details:
Screen name: aya
Stacktrace:
at ave.s(SourceFile:1498)
at ave.av(SourceFile:889)
at ave.a(SourceFile:325)
at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
Minecraft Version: 1.8.8
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 174945128 bytes (166 MB) / 241045504 bytes (229 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.8.8
LWJGL: 2.9.4
OpenGL: AMD Radeon HD 7560D GL version 4.5.13399 Compatibility Profile Context 15.200.1060.0, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 4x AMD A8-5500 APU with Radeon(tm) HD Graphics