Hi chat09tails, I did the same steps you performed as well and receivedsimilar results this morning. The weird thing is (just as with all the previous troubleshooting I've tried before) it is inconsistent. Been following this thread for awhile and hoping to be able to assist where I can. I am wondering if this is still potentially an audio hardware/driver issue but what specific specs that is related to I do not know. However, see my troubleshooting results:
So this morning I tried making a FLA AS3 file with varying versions of 1 MP3 audio file set to 32kbps, 64kbps, 80kbps (original), and 128kbps using Audacity to convert new MP3's out. With all audio files set to stream in Flash, I receivedsimilar yet inconsistent results with the audio replaying from the beginning even though my red timeline head was in the middle of the 500 frame timeline (set at 24fps). Sometimes it would play fine, other times it would reset from the beginning.
To note as of last week, I have currently running a new Dell XPS 8700 computer with a fresh install of Windows 8.1. However, I had to install a new video driver from the Dell website due to some weird video hardware issues. That is resolved now so that got me thinking, maybe I don't have the correct audio driver either? So I went on the Dell website and got a new Realtek ALC3861 Audio Driver. I restarted my computer and BAM! This seemed to resolve the issue. For the last hour, I could not recreate this bug in the FLA I made this morning. I'll keep this thread posted if it does come back though.
To help, I'll provide piece of a report I made with a utility called Speccy before and after the driver install:
Before Audio Driver Install:
-------------------------------------------------
Summary
Operating System
Windows 8.1 Pro 64-bit
CPU
Intel Core i7 4790 @ 3.60GHz 39 °C
Haswell 22nm Technology
RAM
8.00GB Dual-Channel DDR3 @ 798MHz (11-11-11-28)
Motherboard
Dell Inc. 0KWVT8 (CPU 1) 28 °C
Graphics
Acer S202HL (1600x900@60Hz)
DELL 2001FP (1600x1200@60Hz)
1023MB NVIDIA GeForce GT 720 (NVIDIA) 38 °C
Storage
931GB Seagate ST1000DM003-1CH162 (SATA) 32 °C
Optical Drives
PLDS DVD+-RW DH-16AES
Audio
High Definition Audio Device
After Audio Driver Install:
-------------------------------------------------
Summary
Operating System
Windows 8.1 Pro 64-bit
CPU
Intel Core i7 4790 @ 3.60GHz 32 °C
Haswell 22nm Technology
RAM
8.00GB Dual-Channel DDR3 @ 798MHz (11-11-11-28)
Motherboard
Dell Inc. 0KWVT8 (CPU 1) 28 °C
Graphics
Acer S202HL (1600x900@60Hz)
DELL 2001FP (1600x1200@60Hz)
1023MB NVIDIA GeForce GT 720 (NVIDIA) 35 °C
Storage
931GB Seagate ST1000DM003-1CH162 (SATA) 33 °C
Optical Drives
PLDS DVD+-RW DH-16AES
Audio
Realtek High Definition Audio
I hope this helps a bit. If you would like me to provide more detail specs, files, or process, please let me know!