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I have a problem where every couple days I have to manually clear the cache because the default menu disappears until I do so. My client is getting frustrated with the problem. I have searched and have not found anything very helpful. I have included my info below. If anyone has experienced this or has fixed this please respond.

CMS Version
1.9.4.2

Installed Modules
CMSMailer
2.0.1
FileManager
1.1.0
MenuManager
1.7.6
ModuleManager
1.4.2
News
2.11.3
nuSOAP
1.0.2
Printing
1.1.2
Search
1.6.10
ThemeManager
1.1.4
TinyMCE
2.8.4
FormBuilder
0.7
CGExtensions
1.26.3
CGSimpleSmarty
1.4.8
CGBlog
1.7.5

Config Information
php_memory_limit:

process_whole_template:
false
output_compression:
false
max_upload_size:
2000000
default_upload_permission:
664
url_rewriting:
mod_rewrite
page_extension:
/
query_var:
page
image_manipulation_prog:
GD
auto_alias_content:
true
locale:

default_encoding:
utf-8
admin_encoding:
utf-8
set_names:
true
debug:
false

Thanks in advance for any help.

Has the client cleared their browser cache, temp internet files?

If i remeber right, there were some issues with menu pre 1.10.3, so i would suggest you try upgrading first.
Also see your php error logs, if menu disapears it could be related to some kind of error but you might have errors surpresed.