can't write to sql server table says i don't have sufficient permission

Have the following
sql server db with several tables program using to perform CRUD operations on the tables
i have 100's of customer using the app with no issues
this one particular client cannot write to a certain table
says i don't have permission
the login used in the connection string is a systemadmin
table permission does not seem to be overridden
i've dropped the table and recreated it and that works
migrating the data out of this database into a blank one that works is my backup plan but before that i'd like to attempt to fix it.
any advice?
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Anthony PerkinsCommented:
You need to verify that:
A. The server, database, schema and table involved.
B. The user belongs to the sysadmin server role on this same server (why you are using a sysadmin role is beyond the scope of this question)
C. If both A and B are correct than go back to A and re-verify as this simply does not make any sense.

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glenn_rAuthor Commented:
the above all check out
nothing wrong with db
ended up being an application bug
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Microsoft SQL Server

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