WampServer

I have been using Wampserver v 2.1 for a number of years - it has Apache 2.2.17 MySql 5.5.8 PHP 5.3.5 and phpMyAdmin 3.3.9 - on Windows XP with no problems.
Today I was editing a table through phpMyAdmin when the screen changed to white with a red band and the words:
"phpMyAdmin Error
cannot start session without errors, please check errors given in your PHP and/or webserver logfile and configure your PHP installation properly"
No specific error code appears.
The PHP error log is empty.
In fact I can still start Wampserver, I have a green light, localhost works and I can access the databases through the website, I can also update the databases using html forms in the website's pages.
The problem is that I cannot access phpMyAdmin directly to edit or export/import etc.
This happened suddenly - I had not changed any programs on the PC - while I was updating the database.
Can someone explain what happened and how to correct it, please ?
Will re-installing Wampserver correct this ?
Many thanks

How about the MYSQL Error log or the Apache error log? Anything in there that might shed some light on the subject?

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(Windows 10 Pro 64bit) (Wampserver 3.3.4 64bit) Aestan Tray Menu 3.2.5.4
<Apache versions MULTIPE> <PHP versions MULTIPLE> <MySQL Versions MULTIPLE>
<MariaDB versions MULTIPLE> <phpMyAdmin versions MULTIPLE> <MySQL Workbench 8.0.23>
Read The Manuals Apache -- MySQL -- PHP -- phpMyAdmin
Get your Apache/MySQL/mariaDB/PHP ADDONs here from the WAMPServer alternate Repo
-X-X-X- Backup your databases regularly Here is How dont regret it later! Yes even when developing -X-X-X-

Hi,

All "things" you use are totally obsolete and not supported for a long time and it is almost impossible to find a solution to a problem that we can not use the components.

As RiggsFolly write, see errors in mysql error log.

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Documentation Apache - Documentation PHP - Documentation MySQL - Wampserver install files & addons

Thank you Otomatic, RiggsFolly you are quite right - I was attached to Win XP which is why I have kept the old Wampserver so long.
I have installed Win 10 on another machine and will be getting the latest Wampserver. Hopefully I can transfer data from the old one ?
Either side of when the error appeared the Apache log shows:

[Sat Jul 30 17:45:04 2016] [error] [client 127.0.0.1] client denied by server configuration: C:/Dev, referer: [localhost]
[Sat Jul 30 18:27:56 2016] [error] [client 127.0.0.1] client denied by server configuration: C:/Dev, referer: [localhost]
[Sat Jul 30 18:30:05 2016] [error] [client 127.0.0.1] client denied by server configuration: C:/Dev, referer: [localhost]
[Sat Jul 30 18:30:05 2016] [error] [client 127.0.0.1] client denied by server configuration: C:/Dev, referer: [localhost]
[Sat Jul 30 18:30:05 2016] [error] [client 127.0.0.1] client denied by server configuration: C:/Dev, referer: [localhost]
[Sat Jul 30 18:30:05 2016] [error] [client 127.0.0.1] client denied by server configuration: C:/Dev, referer: [localhost]
[Sat Jul 30 19:28:08 2016] [error] [client 127.0.0.1] client denied by server configuration: C:/Dev, referer: [localhost]
[Sat Jul 30 19:28:08 2016] [error] [client 127.0.0.1] client denied by server configuration: C:/Dev, referer: [localhost]
[Sat Jul 30 19:28:08 2016] [error] [client 127.0.0.1] client denied by server configuration: C:/Dev, referer: [localhost]
[Sat Jul 30 19:28:08 2016] [error] [client 127.0.0.1] client denied by server configuration: C:/Dev, referer: [localhost]
[Sat Jul 30 19:35:57 2016] [warn] pid file C:/wamp/bin/apache/Apache2.2.17/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run?
[Sat Jul 30 19:35:57 2016] [notice] Apache/2.2.17 (Win32) PHP/5.3.5 configured -- resuming normal operations
[Sat Jul 30 19:35:57 2016] [notice] Server built: Oct 18 2010 01:58:12

The MySql log:
160730 17:43:33 [Note] Plugin 'FEDERATED' is disabled.
InnoDB: The InnoDB memory heap is disabled
InnoDB: Mutexes and rw_locks use Windows interlocked functions
InnoDB: Compressed tables use zlib 1.2.3
160730 17:43:33 InnoDB: Initializing buffer pool, size = 128.0M
160730 17:43:33 InnoDB: Completed initialization of buffer pool
160730 17:43:33 InnoDB: highest supported file format is Barracuda.
160730 17:43:35 InnoDB: 1.1.4 started; log sequence number 81224434
160730 17:43:39 [Note] Event Scheduler: Loaded 0 events
160730 17:43:39 [Note] wampmysqld: ready for connections.
Version: '5.5.8-log' socket: '' port: 3306 MySQL Community Server (GPL)
160730 19:30:52 [Note] wampmysqld: Normal shutdown